| 摘要 |
An adjustable well screen assembly comprises a sandscreen (5) which is wrapped around a perforated base pipe (3) and a perforated sleeve (1) which is movably disposed concentrically inside the base pipe (3) between a first, closed, and open, position. In said first position of the sleeve (1) the perforations of the sleeve and base pipe (3) are unaligned and hydraulically isolated from each other and flow of fluids from the outer diameter of the screen (5) into the interior of the sleeve (1) is inhibited. In said second position the perforations of the sleeve and the base pipe are aligned and connected in fluid communication with each other and fluids are permitted to flow from the formation through the sandscreen and the perforations of the sleeve and base pipe into the interior of the sleeve.
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